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NEW Audio amplifier kits, modules and many others.

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Cristi

Member
Joined 2008
connexelectronic.com
because I was asked repeatedly about kit purchasing form choices by many ppls, i decided to sell some of the pcb's in kit form as well, the empty pcb and all the parts necessary for assembly a complete amplifier. i will add few thru-hole boards for the beginning. the IRaudamp7 amplifier, LM4702 and LME49810 based amplifiers, all contains only thru-hole components, no SMD.
the prices will be lower than for fully assembled and tested board, arround 70-75% of the assembled board price.
 
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kp93300

Member
Joined 2007
Power soft start

I have another go at posting the picture.
With this soft start, can I omit the thermisters in the picture ?
When is the sale ending ?
thanks
kp93300
 

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nesha

Member
Joined 2007
choice of voltage

Hallo CNX, I'm interested in 3020 module, and would probably use it with high sens. speakers (97+db/w), and i know i can use it with much lower sens.speakers, so i have 2 questions:
1. Will it be quiet enough
2. what is the best voltage for 3020, is there a benefit in running it with lower voltage,say 30-40v, and is there changes in character of sound, is there a sweet spot voltage for this module?
Thaks:confused:
 
C

Cristi

Member
Joined 2008
connexelectronic.com
kp93300 said:
I have another go at posting the picture.
With this soft start, can I omit the thermisters in the picture ?
When is the sale ending ?
thanks
kp93300
Click to expand...

as luka already pointed out, if you remove the thermistors, you won't have the current limit function anymore and the current demand for charging the capacitors can be high enough to trip the mains fuses or even to blow the rectifier diodes.
 
C

Cristi

Member
Joined 2008
connexelectronic.com
nesha said:
Hallo CNX, I'm interested in 3020 module, and would probably use it with high sens. speakers (97+db/w), and i know i can use it with much lower sens.speakers, so i have 2 questions:
1. Will it be quiet enough
2. what is the best voltage for 3020, is there a benefit in running it with lower voltage,say 30-40v, and is there changes in character of sound, is there a sweet spot voltage for this module?
Thaks:confused:
Click to expand...

the TA3020 v3b amp has arround 100dB S/N ratio. with very sensitive speakers still can hear a little noise close to the tweeter. the choice for a very silent amp would be a class AB, LM4702 or LME49810 amplifier, you can check on my website. there is a model which has 123 dB S/N ratio.

the optimum voltage would be between 45 and 55V. the output power depend on the supply voltage as well. less than 36V the amplifier will not start, will be locked in udervoltage protection mode, and over 60V will also lock due to overvoltage. also, i don't recommend to use over 60V because the voltage can increase to dangerous values due to pumping.
 
e_fortier

e_fortier

Member
Joined 2001
Lacking mids and highs on TA2022 PCB.

Hi Cristi,

One of my friend has recently purchased a TA2022 power amp from you based on my recommendation. He finds himself not very satisfied with the mids and high, it seems has they are lacking or not present enough in the music, the bass is great but I would like to know if this is the first time you receive this comment regarding your TA2022 PCB.

Please let me know if there is some possible mods to improve this.

Thanks,

Eric
 
P

pincellone

Member
Joined 2007
LME49810 Amp

Hallo CNX,

I'm quite interested in your amp based on LME49810, but I wonder how can I put this one into a chassis, there seems to be no screw holes available or suitable points to install it. They must be located on one side, I guess...

Also, is it mono or stereo? Do I need a pair of them to build a stereo amp?

Thanks!

An externally hosted image should be here but it was not working when we last tested it.
 
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